Breast pump



FIG. 1 is a perspective view of a breast pump showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

Any shading and cross-hatching are not features of the design but are utilized to illustrate the surface contours of the breast pump design in the drawings. 

CLAIM The ornamental design for a breast pump, as shown and described. 